145931961 has 16 divisors (see below), whose sum is σ = 235453824. Its totient is φ = 78484224.

The previous prime is 145931953. The next prime is 145931969. The reversal of 145931961 is 169139541.

It is an interprime number because it is at equal distance from previous prime (145931953) and next prime (145931969).

It is not a de Polignac number, because 145931961 - 2³ = 145931953 is a prime.

It is a super-2 number, since 2×145931961² = 42592274482611042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145931969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204030 + ... + 204743.

It is an arithmetic number, because the mean of its divisors is an integer number (14715864).

Almost surely, 2^145931961 is an apocalyptic number.

It is an amenable number.

145931961 is a deficient number, since it is larger than the sum of its proper divisors (89521863).

145931961 is a wasteful number, since it uses less digits than its factorization.

145931961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408800.

The product of its digits is 29160, while the sum is 39.

The square root of 145931961 is about 12080.2301716482. The cubic root of 145931961 is about 526.4819335996.

The spelling of 145931961 in words is "one hundred forty-five million, nine hundred thirty-one thousand, nine hundred sixty-one".