31898649 has 4 divisors (see below), whose sum is σ = 42531536. Its totient is φ = 21265764.

The previous prime is 31898641. The next prime is 31898651. The reversal of 31898649 is 94689813.

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.

It is not a de Polignac number, because 31898649 - 2³ = 31898641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31898598 and 31898607.

It is not an unprimeable number, because it can be changed into a prime (31898641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5316439 + ... + 5316444.

It is an arithmetic number, because the mean of its divisors is an integer number (10632884).

Almost surely, 2^31898649 is an apocalyptic number.

It is an amenable number.

31898649 is a deficient number, since it is larger than the sum of its proper divisors (10632887).

31898649 is a wasteful number, since it uses less digits than its factorization.

31898649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10632886.

The product of its digits is 373248, while the sum is 48.

The square root of 31898649 is about 5647.8888976325. Note that the first 4 decimals coincide. The cubic root of 31898649 is about 317.1446794856.

The spelling of 31898649 in words is "thirty-one million, eight hundred ninety-eight thousand, six hundred forty-nine".