31428977 has 2 divisors, whose sum is σ = 31428978. Its totient is φ = 31428976.

The previous prime is 31428973. The next prime is 31428997. The reversal of 31428977 is 77982413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29986576 + 1442401 = 5476^2 + 1201^2 .

It is a cyclic number.

It is not a de Polignac number, because 31428977 - 2² = 31428973 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31428973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15714488 + 15714489.

It is an arithmetic number, because the mean of its divisors is an integer number (15714489).

Almost surely, 2^31428977 is an apocalyptic number.

It is an amenable number.

31428977 is a deficient number, since it is larger than the sum of its proper divisors (1).

31428977 is an equidigital number, since it uses as much as digits as its factorization.

31428977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 31428977 is about 5606.1552779066. The cubic root of 31428977 is about 315.5804431694.

The spelling of 31428977 in words is "thirty-one million, four hundred twenty-eight thousand, nine hundred seventy-seven".