1081687451 has 4 divisors (see below), whose sum is σ = 1164894192. Its totient is φ = 998480712.

The previous prime is 1081687429. The next prime is 1081687483. The reversal of 1081687451 is 1547861801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1547861801 = 641 ⋅2414761.

It is a cyclic number.

It is not a de Polignac number, because 1081687451 - 2²² = 1077493147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1081687399 and 1081687408.

It is not an unprimeable number, because it can be changed into a prime (1081687421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41603351 + ... + 41603376.

It is an arithmetic number, because the mean of its divisors is an integer number (291223548).

Almost surely, 2^1081687451 is an apocalyptic number.

1081687451 is a deficient number, since it is larger than the sum of its proper divisors (83206741).

1081687451 is an equidigital number, since it uses as much as digits as its factorization.

1081687451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83206740.

The product of its (nonzero) digits is 53760, while the sum is 41.

The square root of 1081687451 is about 32889.0171789915. The cubic root of 1081687451 is about 1026.5196419140.

The spelling of 1081687451 in words is "one billion, eighty-one million, six hundred eighty-seven thousand, four hundred fifty-one".