31481901 has 18 divisors (see below), whose sum is σ = 49985390. Its totient is φ = 19079280.

The previous prime is 31481899. The next prime is 31481911. The reversal of 31481901 is 10918413.

It can be written as a sum of positive squares in only one way, i.e., 31472100 + 9801 = 5610^2 + 99^2 .

It is not a de Polignac number, because 31481901 - 2¹ = 31481899 is a prime.

It is a super-2 number, since 2×31481901² = 1982220181147602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31481911) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13366 + ... + 15543.

Almost surely, 2^31481901 is an apocalyptic number.

It is an amenable number.

31481901 is a deficient number, since it is larger than the sum of its proper divisors (18503489).

31481901 is a wasteful number, since it uses less digits than its factorization.

31481901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28937 (or 28923 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 31481901 is about 5610.8734614140. The cubic root of 31481901 is about 315.7574816319.

It can be divided in two parts, 314 and 81901, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 31481901 in words is "thirty-one million, four hundred eighty-one thousand, nine hundred one".