161390377 has 4 divisors (see below), whose sum is σ = 161503056. Its totient is φ = 161277700.

The previous prime is 161390363. The next prime is 161390387. The reversal of 161390377 is 773093161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 773093161 = 3583 ⋅215767.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161390377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161390357) 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, 54163 + ... + 57064.

It is an arithmetic number, because the mean of its divisors is an integer number (40375764).

Almost surely, 2^161390377 is an apocalyptic number.

It is an amenable number.

161390377 is a deficient number, since it is larger than the sum of its proper divisors (112679).

161390377 is a wasteful number, since it uses less digits than its factorization.

161390377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112678.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 161390377 is about 12703.9512357376. The cubic root of 161390377 is about 544.4515167653.

The spelling of 161390377 in words is "one hundred sixty-one million, three hundred ninety thousand, three hundred seventy-seven".