31551049 has 4 divisors (see below), whose sum is σ = 31602640. Its totient is φ = 31499460.

The previous prime is 31551019. The next prime is 31551067. The reversal of 31551049 is 94015513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94015513 = 23 ⋅4087631.

It is a cyclic number.

It is not a de Polignac number, because 31551049 - 2⁷ = 31550921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31551019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24867 + ... + 26104.

It is an arithmetic number, because the mean of its divisors is an integer number (7900660).

Almost surely, 2^31551049 is an apocalyptic number.

It is an amenable number.

31551049 is a deficient number, since it is larger than the sum of its proper divisors (51591).

31551049 is an equidigital number, since it uses as much as digits as its factorization.

31551049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51590.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 31551049 is about 5617.0320454845. The cubic root of 31551049 is about 315.9884930115.

The spelling of 31551049 in words is "thirty-one million, five hundred fifty-one thousand, forty-nine".