161231270 has 16 divisors (see below), whose sum is σ = 297295488. Its totient is φ = 62919360.

The previous prime is 161231269. The next prime is 161231309. The reversal of 161231270 is 72132161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196214 + ... + 197033.

It is an arithmetic number, because the mean of its divisors is an integer number (18580968).

Almost surely, 2^161231270 is an apocalyptic number.

161231270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161231270 is a deficient number, since it is larger than the sum of its proper divisors (136064218).

161231270 is a wasteful number, since it uses less digits than its factorization.

161231270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393295.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 161231270 is about 12697.6875847534. The cubic root of 161231270 is about 544.2725417617.

The spelling of 161231270 in words is "one hundred sixty-one million, two hundred thirty-one thousand, two hundred seventy".