1087621731 has 24 divisors (see below), whose sum is σ = 1889937920. Its totient is φ = 588787056.

The previous prime is 1087621727. The next prime is 1087621751. The reversal of 1087621731 is 1371267801.

It is not a de Polignac number, because 1087621731 - 2² = 1087621727 is a prime.

It is a super-2 number, since 2×1087621731² = 2365842059486872722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1087621751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 453115 + ... + 455508.

Almost surely, 2^1087621731 is an apocalyptic number.

1087621731 is a deficient number, since it is larger than the sum of its proper divisors (802316189).

1087621731 is a wasteful number, since it uses less digits than its factorization.

1087621731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908655 (or 908652 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 1087621731 is about 32979.1105246943. The cubic root of 1087621731 is about 1028.3934268444.

The spelling of 1087621731 in words is "one billion, eighty-seven million, six hundred twenty-one thousand, seven hundred thirty-one".