31139977 has 8 divisors (see below), whose sum is σ = 34889472. Its totient is φ = 27543600.

The previous prime is 31139959. The next prime is 31139981. The reversal of 31139977 is 77993113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31139977 - 2²³ = 22751369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31139947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37849 + ... + 38662.

It is an arithmetic number, because the mean of its divisors is an integer number (4361184).

Almost surely, 2^31139977 is an apocalyptic number.

31139977 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

31139977 is a deficient number, since it is larger than the sum of its proper divisors (3749495).

31139977 is a wasteful number, since it uses less digits than its factorization.

31139977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76559.

The product of its digits is 35721, while the sum is 40.

The square root of 31139977 is about 5580.3205105083. The cubic root of 31139977 is about 314.6101736885.

The spelling of 31139977 in words is "thirty-one million, one hundred thirty-nine thousand, nine hundred seventy-seven".