1990503531 has 64 divisors (see below), whose sum is σ = 3202467840. Its totient is φ = 1217341440.

The previous prime is 1990503527. The next prime is 1990503539. The reversal of 1990503531 is 1353050991.

1990503531 is a `hidden beast` number, since 19 + 90 + 503 + 53 + 1 = 666.

It is not a de Polignac number, because 1990503531 - 2² = 1990503527 is a prime.

It is a super-2 number, since 2×1990503531² = 7924208613846935922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1990503539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3356371 + ... + 3356963.

It is an arithmetic number, because the mean of its divisors is an integer number (50038560).

Almost surely, 2^1990503531 is an apocalyptic number.

1990503531 is a deficient number, since it is larger than the sum of its proper divisors (1211964309).

1990503531 is a wasteful number, since it uses less digits than its factorization.

1990503531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 18225, while the sum is 36.

The square root of 1990503531 is about 44615.0594642661. The cubic root of 1990503531 is about 1257.9237518060.

It can be divided in two parts, 1990 and 503531, that added together give a square (505521 = 711²).

The spelling of 1990503531 in words is "one billion, nine hundred ninety million, five hundred three thousand, five hundred thirty-one".