1631620968731 has 16 divisors (see below), whose sum is σ = 1862825446944. Its totient is φ = 1415738141184.

The previous prime is 1631620968727. The next prime is 1631620968743. The reversal of 1631620968731 is 1378690261361.

It is a cyclic number.

It is not a de Polignac number, because 1631620968731 - 2² = 1631620968727 is a prime.

It is a super-2 number, since 2×1631620968731² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631620968031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4455545 + ... + 4807818.

It is an arithmetic number, because the mean of its divisors is an integer number (116426590434).

Almost surely, 2^{1631620968731} is an apocalyptic number.

1631620968731 is a deficient number, since it is larger than the sum of its proper divisors (231204478213).

1631620968731 is a wasteful number, since it uses less digits than its factorization.

1631620968731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264190.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 1631620968731 in words is "one trillion, six hundred thirty-one billion, six hundred twenty million, nine hundred sixty-eight thousand, seven hundred thirty-one".