1551565240 has 32 divisors (see below), whose sum is σ = 3499763760. Its totient is φ = 619072000.

The previous prime is 1551565229. The next prime is 1551565241. The reversal of 1551565240 is 425651551.

It is a junction number, because it is equal to n+sod(n) for n = 1551565196 and 1551565205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551565241) 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, 32326 + ... + 64405.

Almost surely, 2^1551565240 is an apocalyptic number.

1551565240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551565240 is an abundant number, since it is smaller than the sum of its proper divisors (1948198520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551565240 is a wasteful number, since it uses less digits than its factorization.

1551565240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97143 (or 97139 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

The square root of 1551565240 is about 39389.9129219652. The cubic root of 1551565240 is about 1157.6839539890.

The spelling of 1551565240 in words is "one billion, five hundred fifty-one million, five hundred sixty-five thousand, two hundred forty".