1231652661 has 16 divisors (see below), whose sum is σ = 1697223168. Its totient is φ = 793656000.

The previous prime is 1231652659. The next prime is 1231652663. The reversal of 1231652661 is 1662561321.

It is an interprime number because it is at equal distance from previous prime (1231652659) and next prime (1231652663).

It is not a de Polignac number, because 1231652661 - 2¹ = 1231652659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231652663) 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, 74011 + ... + 89111.

It is an arithmetic number, because the mean of its divisors is an integer number (106076448).

Almost surely, 2^1231652661 is an apocalyptic number.

It is an amenable number.

1231652661 is a deficient number, since it is larger than the sum of its proper divisors (465570507).

1231652661 is a wasteful number, since it uses less digits than its factorization.

1231652661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16012.

The product of its digits is 12960, while the sum is 33.

The square root of 1231652661 is about 35094.9093316965. The cubic root of 1231652661 is about 1071.9209273399.

The spelling of 1231652661 in words is "one billion, two hundred thirty-one million, six hundred fifty-two thousand, six hundred sixty-one".