31545394 has 4 divisors (see below), whose sum is σ = 47318094. Its totient is φ = 15772696.

The previous prime is 31545391. The next prime is 31545401. The reversal of 31545394 is 49354513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49354513 = 13 ⋅3796501.

It can be written as a sum of positive squares in only one way, i.e., 22212369 + 9333025 = 4713^2 + 3055^2 .

It is a super-2 number, since 2×31545394² = 1990223765230472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31545391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7886347 + ... + 7886350.

Almost surely, 2^31545394 is an apocalyptic number.

31545394 is a deficient number, since it is larger than the sum of its proper divisors (15772700).

31545394 is a wasteful number, since it uses less digits than its factorization.

31545394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15772699.

The product of its digits is 32400, while the sum is 34.

The square root of 31545394 is about 5616.5286432101. The cubic root of 31545394 is about 315.9696133255.

The spelling of 31545394 in words is "thirty-one million, five hundred forty-five thousand, three hundred ninety-four".