31977401 has 4 divisors (see below), whose sum is σ = 33080100. Its totient is φ = 30874704.

The previous prime is 31977389. The next prime is 31977403. The reversal of 31977401 is 10477913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10477913 = 3221 ⋅3253.

It can be written as a sum of positive squares in 2 ways, for example, as 27290176 + 4687225 = 5224^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 31977401 - 2¹⁰ = 31976377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31977403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551306 + ... + 551363.

It is an arithmetic number, because the mean of its divisors is an integer number (8270025).

Almost surely, 2^31977401 is an apocalyptic number.

It is an amenable number.

31977401 is a deficient number, since it is larger than the sum of its proper divisors (1102699).

31977401 is a wasteful number, since it uses less digits than its factorization.

31977401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102698.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 31977401 is about 5654.8564084334. The cubic root of 31977401 is about 317.4054559674.

The spelling of 31977401 in words is "thirty-one million, nine hundred seventy-seven thousand, four hundred one".