1402631561 has 8 divisors (see below), whose sum is σ = 1414539264. Its totient is φ = 1390737600.

The previous prime is 1402631551. The next prime is 1402631579. The reversal of 1402631561 is 1651362041.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1402631561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1402631501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353756 + ... + 357698.

It is an arithmetic number, because the mean of its divisors is an integer number (176817408).

Almost surely, 2^1402631561 is an apocalyptic number.

It is an amenable number.

1402631561 is a deficient number, since it is larger than the sum of its proper divisors (11907703).

1402631561 is a wasteful number, since it uses less digits than its factorization.

1402631561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6871.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1402631561 is about 37451.7230711752. The cubic root of 1402631561 is about 1119.3894315051.

The spelling of 1402631561 in words is "one billion, four hundred two million, six hundred thirty-one thousand, five hundred sixty-one".