31401977 has 4 divisors (see below), whose sum is σ = 32414976. Its totient is φ = 30388980.

The previous prime is 31401967. The next prime is 31401991. The reversal of 31401977 is 77910413.

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.

It is a cyclic number.

It is not a de Polignac number, because 31401977 - 2⁴ = 31401961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31401967) 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, 506453 + ... + 506514.

It is an arithmetic number, because the mean of its divisors is an integer number (8103744).

Almost surely, 2^31401977 is an apocalyptic number.

It is an amenable number.

31401977 is a deficient number, since it is larger than the sum of its proper divisors (1012999).

31401977 is a wasteful number, since it uses less digits than its factorization.

31401977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012998.

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

The square root of 31401977 is about 5603.7466930617. The cubic root of 31401977 is about 315.4900476817.

The spelling of 31401977 in words is "thirty-one million, four hundred one thousand, nine hundred seventy-seven".