1990662481 has 8 divisors (see below), whose sum is σ = 2112321024. Its totient is φ = 1869510720.

The previous prime is 1990662473. The next prime is 1990662491. The reversal of 1990662481 is 1842660991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1990662481 - 2³ = 1990662473 is a prime.

It is a super-2 number, since 2×1990662481² = 7925474226522150722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990662431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118585 + ... + 134326.

It is an arithmetic number, because the mean of its divisors is an integer number (264040128).

Almost surely, 2^1990662481 is an apocalyptic number.

It is an amenable number.

1990662481 is a deficient number, since it is larger than the sum of its proper divisors (121658543).

1990662481 is a wasteful number, since it uses less digits than its factorization.

1990662481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253391.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1990662481 is about 44616.8407778946. The cubic root of 1990662481 is about 1257.9572343989.

The spelling of 1990662481 in words is "one billion, nine hundred ninety million, six hundred sixty-two thousand, four hundred eighty-one".