155749401 has 12 divisors (see below), whose sum is σ = 232729380. Its totient is φ = 100252320.

The previous prime is 155749381. The next prime is 155749421. The reversal of 155749401 is 104947551.

It is an interprime number because it is at equal distance from previous prime (155749381) and next prime (155749421).

It can be written as a sum of positive squares in 2 ways, for example, as 44235801 + 111513600 = 6651^2 + 10560^2 .

It is not a de Polignac number, because 155749401 - 2⁷ = 155749273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155749421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 298110 + ... + 298631.

It is an arithmetic number, because the mean of its divisors is an integer number (19394115).

Almost surely, 2^155749401 is an apocalyptic number.

It is an amenable number.

155749401 is a deficient number, since it is larger than the sum of its proper divisors (76979979).

155749401 is a wasteful number, since it uses less digits than its factorization.

155749401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596776 (or 596773 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 155749401 is about 12479.9599758974. The cubic root of 155749401 is about 538.0328529387.

The spelling of 155749401 in words is "one hundred fifty-five million, seven hundred forty-nine thousand, four hundred one".