161151031 has 4 divisors (see below), whose sum is σ = 161460864. Its totient is φ = 160841200.

The previous prime is 161151017. The next prime is 161151037. The reversal of 161151031 is 130151161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161151031 - 2¹⁹ = 160626743 is a prime.

It is a super-2 number, since 2×161151031² = 51939309584725922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161151037) 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, 154135 + ... + 155176.

It is an arithmetic number, because the mean of its divisors is an integer number (40365216).

Almost surely, 2^161151031 is an apocalyptic number.

161151031 is a deficient number, since it is larger than the sum of its proper divisors (309833).

161151031 is an equidigital number, since it uses as much as digits as its factorization.

161151031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309832.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 161151031 is about 12694.5276005057. The cubic root of 161151031 is about 544.1822384950.

The spelling of 161151031 in words is "one hundred sixty-one million, one hundred fifty-one thousand, thirty-one".