1051621388 has 12 divisors (see below), whose sum is σ = 1840733160. Its totient is φ = 525697632.

The previous prime is 1051621327. The next prime is 1051621391. The reversal of 1051621388 is 8831261501.

It is a super-2 number, since 2×1051621388² = 2211815087398093088, which contains 22 as substring.

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, 5258 + ... + 46161.

It is an arithmetic number, because the mean of its divisors is an integer number (153394430).

Almost surely, 2^1051621388 is an apocalyptic number.

It is an amenable number.

1051621388 is a deficient number, since it is larger than the sum of its proper divisors (789111772).

1051621388 is a wasteful number, since it uses less digits than its factorization.

1051621388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56536 (or 56534 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1051621388 is about 32428.7124012040. The cubic root of 1051621388 is about 1016.9192537444.

Adding to 1051621388 its reverse (8831261501), we get a palindrome (9882882889).

The spelling of 1051621388 in words is "one billion, fifty-one million, six hundred twenty-one thousand, three hundred eighty-eight".