31402769 has 2 divisors, whose sum is σ = 31402770. Its totient is φ = 31402768.

The previous prime is 31402759. The next prime is 31402781. The reversal of 31402769 is 96720413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19465744 + 11937025 = 4412^2 + 3455^2 .

It is an emirp because it is prime and its reverse (96720413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31402769 - 2²⁰ = 30354193 is a prime.

It is a super-2 number, since 2×31402769² = 1972267801734722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31402759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15701384 + 15701385.

It is an arithmetic number, because the mean of its divisors is an integer number (15701385).

Almost surely, 2^31402769 is an apocalyptic number.

It is an amenable number.

31402769 is a deficient number, since it is larger than the sum of its proper divisors (1).

31402769 is an equidigital number, since it uses as much as digits as its factorization.

31402769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 31402769 is about 5603.8173596219. The cubic root of 31402769 is about 315.4927000202.

The spelling of 31402769 in words is "thirty-one million, four hundred two thousand, seven hundred sixty-nine".