156463981 has 8 divisors (see below), whose sum is σ = 158147640. Its totient is φ = 154785792.

The previous prime is 156463943. The next prime is 156463991. The reversal of 156463981 is 189364651.

It can be written as a sum of positive squares in 4 ways, for example, as 21114025 + 135349956 = 4595^2 + 11634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 156463981 - 2¹¹ = 156461933 is a prime.

It is a super-2 number, since 2×156463981² = 48961954700736722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156463991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81885 + ... + 83773.

It is an arithmetic number, because the mean of its divisors is an integer number (19768455).

Almost surely, 2^156463981 is an apocalyptic number.

It is an amenable number.

156463981 is a deficient number, since it is larger than the sum of its proper divisors (1683659).

156463981 is a wasteful number, since it uses less digits than its factorization.

156463981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735.

The product of its digits is 155520, while the sum is 43.

The square root of 156463981 is about 12508.5563115813. The cubic root of 156463981 is about 538.8544313360.

The spelling of 156463981 in words is "one hundred fifty-six million, four hundred sixty-three thousand, nine hundred eighty-one".