31436945 has 16 divisors (see below), whose sum is σ = 39272448. Its totient is φ = 24131520.

The previous prime is 31436941. The next prime is 31436947. The reversal of 31436945 is 54963413.

It is a happy number.

It is not a de Polignac number, because 31436945 - 2² = 31436941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31436941) 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, 18887 + ... + 20483.

It is an arithmetic number, because the mean of its divisors is an integer number (2454528).

Almost surely, 2^31436945 is an apocalyptic number.

It is an amenable number.

31436945 is a deficient number, since it is larger than the sum of its proper divisors (7835503).

31436945 is a wasteful number, since it uses less digits than its factorization.

31436945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760.

The product of its digits is 38880, while the sum is 35.

The square root of 31436945 is about 5606.8658803292. The cubic root of 31436945 is about 315.6071099882.

The spelling of 31436945 in words is "thirty-one million, four hundred thirty-six thousand, nine hundred forty-five".