31415977 has 2 divisors, whose sum is σ = 31415978. Its totient is φ = 31415976.

The previous prime is 31415971. The next prime is 31415981. The reversal of 31415977 is 77951413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27499536 + 3916441 = 5244^2 + 1979^2 .

It is an emirp because it is prime and its reverse (77951413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31415977 is a prime.

It is a super-2 number, since 2×31415977² = 1973927221729058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31415971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15707988 + 15707989.

It is an arithmetic number, because the mean of its divisors is an integer number (15707989).

Almost surely, 2^31415977 is an apocalyptic number.

It is an amenable number.

31415977 is a deficient number, since it is larger than the sum of its proper divisors (1).

31415977 is an equidigital number, since it uses as much as digits as its factorization.

31415977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 37.

The square root of 31415977 is about 5604.9957181072. The cubic root of 31415977 is about 315.5369258813.

The spelling of 31415977 in words is "thirty-one million, four hundred fifteen thousand, nine hundred seventy-seven".