1551648988 has 12 divisors (see below), whose sum is σ = 2766619800. Its totient is φ = 761186192.

The previous prime is 1551648953. The next prime is 1551649037. The reversal of 1551648988 is 8898461551.

It is a super-2 number, since 2×1551648988² = 4815229163922848288, 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, 3659338 + ... + 3659761.

It is an arithmetic number, because the mean of its divisors is an integer number (230551650).

Almost surely, 2^1551648988 is an apocalyptic number.

It is an amenable number.

1551648988 is a deficient number, since it is larger than the sum of its proper divisors (1214970812).

1551648988 is a wasteful number, since it uses less digits than its factorization.

1551648988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7319156 (or 7319154 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 55.

The square root of 1551648988 is about 39390.9759716613. The cubic root of 1551648988 is about 1157.7047828417.

The spelling of 1551648988 in words is "one billion, five hundred fifty-one million, six hundred forty-eight thousand, nine hundred eighty-eight".