161253631 has 8 divisors (see below), whose sum is σ = 201043584. Its totient is φ = 125652120.

The previous prime is 161253629. The next prime is 161253641. The reversal of 161253631 is 136352161.

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

It is not a de Polignac number, because 161253631 - 2¹ = 161253629 is a prime.

It is a super-2 number, since 2×161253631² = 52005467021368322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161253631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161253641) 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, 1047025 + ... + 1047178.

It is an arithmetic number, because the mean of its divisors is an integer number (25130448).

Almost surely, 2^161253631 is an apocalyptic number.

161253631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161253631 is a deficient number, since it is larger than the sum of its proper divisors (39789953).

161253631 is a wasteful number, since it uses less digits than its factorization.

161253631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094221.

The product of its digits is 3240, while the sum is 28.

The square root of 161253631 is about 12698.5680688808. The cubic root of 161253631 is about 544.2977021327.

The spelling of 161253631 in words is "one hundred sixty-one million, two hundred fifty-three thousand, six hundred thirty-one".