31987394974399 has 2 divisors, whose sum is σ = 31987394974400. Its totient is φ = 31987394974398.

The previous prime is 31987394974369. The next prime is 31987394974429. The reversal of 31987394974399 is 99347949378913.

It is a balanced prime because it is at equal distance from previous prime (31987394974369) and next prime (31987394974429).

It is a cyclic number.

It is not a de Polignac number, because 31987394974399 - 2¹³ = 31987394966207 is a prime.

It is a super-2 number, since 2×31987394974399² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31987394974369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15993697487199 + 15993697487200.

It is an arithmetic number, because the mean of its divisors is an integer number (15993697487200).

Almost surely, 2^{31987394974399} is an apocalyptic number.

31987394974399 is a deficient number, since it is larger than the sum of its proper divisors (1).

31987394974399 is an equidigital number, since it uses as much as digits as its factorization.

31987394974399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9999593856, while the sum is 85.

The spelling of 31987394974399 in words is "thirty-one trillion, nine hundred eighty-seven billion, three hundred ninety-four million, nine hundred seventy-four thousand, three hundred ninety-nine".