31154350729 has 2 divisors, whose sum is σ = 31154350730. Its totient is φ = 31154350728.

The previous prime is 31154350727. The next prime is 31154350741. The reversal of 31154350729 is 92705345113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16283036025 + 14871314704 = 127605^2 + 121948^2 .

It is a cyclic number.

It is not a de Polignac number, because 31154350729 - 2¹ = 31154350727 is a prime.

Together with 31154350727, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31154350691 and 31154350700.

It is not a weakly prime, because it can be changed into another prime (31154350727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15577175364 + 15577175365.

It is an arithmetic number, because the mean of its divisors is an integer number (15577175365).

Almost surely, 2^31154350729 is an apocalyptic number.

It is an amenable number.

31154350729 is a deficient number, since it is larger than the sum of its proper divisors (1).

31154350729 is an equidigital number, since it uses as much as digits as its factorization.

31154350729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 31154350729 in words is "thirty-one billion, one hundred fifty-four million, three hundred fifty thousand, seven hundred twenty-nine".