1551535140 has 24 divisors (see below), whose sum is σ = 4344298560. Its totient is φ = 413742688.

The previous prime is 1551535129. The next prime is 1551535157. The reversal of 1551535140 is 415351551.

It is a super-2 number, since 2×1551535140² = 4814522581309639200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1551535098 and 1551535107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12929400 + ... + 12929519.

It is an arithmetic number, because the mean of its divisors is an integer number (181012440).

Almost surely, 2^1551535140 is an apocalyptic number.

1551535140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551535140 is an abundant number, since it is smaller than the sum of its proper divisors (2792763420).

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

1551535140 is a wasteful number, since it uses less digits than its factorization.

1551535140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25858931 (or 25858929 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 1551535140 is about 39389.5308425983. The cubic root of 1551535140 is about 1157.6764676753.

Adding to 1551535140 its reverse (415351551), we get a palindrome (1966886691).

The spelling of 1551535140 in words is "one billion, five hundred fifty-one million, five hundred thirty-five thousand, one hundred forty".