2154317990 has 32 divisors (see below), whose sum is σ = 4258720800. Its totient is φ = 778124800.

The previous prime is 2154317969. The next prime is 2154318011. The reversal of 2154317990 is 997134512.

It is an interprime number because it is at equal distance from previous prime (2154317969) and next prime (2154318011).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49331 + ... + 82110.

It is an arithmetic number, because the mean of its divisors is an integer number (133085025).

Almost surely, 2^2154317990 is an apocalyptic number.

2154317990 is a deficient number, since it is larger than the sum of its proper divisors (2104402810).

2154317990 is a wasteful number, since it uses less digits than its factorization.

2154317990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131608.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 2154317990 is about 46414.6312061186. The cubic root of 2154317990 is about 1291.5263446501.

The spelling of 2154317990 in words is "two billion, one hundred fifty-four million, three hundred seventeen thousand, nine hundred ninety".