31470661 has 2 divisors, whose sum is σ = 31470662. Its totient is φ = 31470660.

The previous prime is 31470653. The next prime is 31470701. The reversal of 31470661 is 16607413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25250625 + 6220036 = 5025^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 31470661 - 2³ = 31470653 is a prime.

It is equal to p_1943155 and since 31470661 and 1943155 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31470641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15735330 + 15735331.

It is an arithmetic number, because the mean of its divisors is an integer number (15735331).

Almost surely, 2^31470661 is an apocalyptic number.

It is an amenable number.

31470661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31470661 is an equidigital number, since it uses as much as digits as its factorization.

31470661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 31470661 is about 5609.8717454145. The cubic root of 31470661 is about 315.7198988044.

It can be divided in two parts, 31470 and 661, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 31470661 in words is "thirty-one million, four hundred seventy thousand, six hundred sixty-one".