161274251 has 4 divisors (see below), whose sum is σ = 161307600. Its totient is φ = 161240904.

The previous prime is 161274241. The next prime is 161274259. The reversal of 161274251 is 152472161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152472161 = 5591 ⋅27271.

It is a cyclic number.

It is not a de Polignac number, because 161274251 - 2¹⁰ = 161273227 is a prime.

It is a super-2 number, since 2×161274251² = 52018768071222002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161274259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7871 + ... + 19608.

It is an arithmetic number, because the mean of its divisors is an integer number (40326900).

Almost surely, 2^161274251 is an apocalyptic number.

161274251 is a deficient number, since it is larger than the sum of its proper divisors (33349).

161274251 is an equidigital number, since it uses as much as digits as its factorization.

161274251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33348.

The product of its digits is 3360, while the sum is 29.

The square root of 161274251 is about 12699.3799454934. The cubic root of 161274251 is about 544.3209014869.

The spelling of 161274251 in words is "one hundred sixty-one million, two hundred seventy-four thousand, two hundred fifty-one".