31426749 has 18 divisors (see below), whose sum is σ = 47095230. Its totient is φ = 20170416.

The previous prime is 31426729. The next prime is 31426751. The reversal of 31426749 is 94762413.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 4334724 = 5205^2 + 2082^2 .

It is not a de Polignac number, because 31426749 - 2¹⁵ = 31393981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31426709) 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, 90394 + ... + 90740.

Almost surely, 2^31426749 is an apocalyptic number.

It is an amenable number.

31426749 is a deficient number, since it is larger than the sum of its proper divisors (15668481).

31426749 is an equidigital number, since it uses as much as digits as its factorization.

31426749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 379 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 31426749 is about 5605.9565642270. The cubic root of 31426749 is about 315.5729858279.

The spelling of 31426749 in words is "thirty-one million, four hundred twenty-six thousand, seven hundred forty-nine".