1351611988 has 12 divisors (see below), whose sum is σ = 2365657812. Its totient is φ = 675709760.

The previous prime is 1351611931. The next prime is 1351612007. The reversal of 1351611988 is 8891161531.

It can be written as a sum of positive squares in 2 ways, for example, as 1068766864 + 282845124 = 32692^2 + 16818^2 .

It is a super-2 number, since 2×1351611988² = 3653709932210624288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14358 + ... + 53938.

It is an arithmetic number, because the mean of its divisors is an integer number (197138151).

Almost surely, 2^1351611988 is an apocalyptic number.

It is an amenable number.

1351611988 is a deficient number, since it is larger than the sum of its proper divisors (1014045824).

1351611988 is a wasteful number, since it uses less digits than its factorization.

1351611988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48122 (or 48120 counting only the distinct ones).

The product of its digits is 51840, while the sum is 43.

The square root of 1351611988 is about 36764.2759754629. The cubic root of 1351611988 is about 1105.6491719948.

The spelling of 1351611988 in words is "one billion, three hundred fifty-one million, six hundred eleven thousand, nine hundred eighty-eight".