31457289 has 16 divisors (see below), whose sum is σ = 43360128. Its totient is φ = 20270592.

The previous prime is 31457287. The next prime is 31457297. The reversal of 31457289 is 98275413.

It is not a de Polignac number, because 31457289 - 2¹ = 31457287 is a prime.

It is a super-2 number, since 2×31457289² = 1979122062459042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31457287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17689 + ... + 19385.

It is an arithmetic number, because the mean of its divisors is an integer number (2710008).

Almost surely, 2^31457289 is an apocalyptic number.

It is an amenable number.

31457289 is a deficient number, since it is larger than the sum of its proper divisors (11902839).

31457289 is a wasteful number, since it uses less digits than its factorization.

31457289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904.

The product of its digits is 60480, while the sum is 39.

The square root of 31457289 is about 5608.6797911808. The cubic root of 31457289 is about 315.6751756194.

The spelling of 31457289 in words is "thirty-one million, four hundred fifty-seven thousand, two hundred eighty-nine".