31987601 has 2 divisors, whose sum is σ = 31987602. Its totient is φ = 31987600.

The previous prime is 31987547. The next prime is 31987643. The reversal of 31987601 is 10678913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30030400 + 1957201 = 5480^2 + 1399^2 .

It is a cyclic number.

It is not a de Polignac number, because 31987601 - 2⁶ = 31987537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31987001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15993800 + 15993801.

It is an arithmetic number, because the mean of its divisors is an integer number (15993801).

Almost surely, 2^31987601 is an apocalyptic number.

It is an amenable number.

31987601 is a deficient number, since it is larger than the sum of its proper divisors (1).

31987601 is an equidigital number, since it uses as much as digits as its factorization.

31987601 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 35.

The square root of 31987601 is about 5655.7582161899. The cubic root of 31987601 is about 317.4392005431.

The spelling of 31987601 in words is "thirty-one million, nine hundred eighty-seven thousand, six hundred one".