1911631990 has 16 divisors (see below), whose sum is σ = 3622039920. Its totient is φ = 724407840.

The previous prime is 1911631901. The next prime is 1911631993. The reversal of 1911631990 is 991361191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1911631993) 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, 5030421 + ... + 5030800.

It is an arithmetic number, because the mean of its divisors is an integer number (226377495).

Almost surely, 2^1911631990 is an apocalyptic number.

1911631990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1911631990 is a deficient number, since it is larger than the sum of its proper divisors (1710407930).

1911631990 is a wasteful number, since it uses less digits than its factorization.

1911631990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061247.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 1911631990 is about 43722.2139192425. The cubic root of 1911631990 is about 1241.0847233090.

The spelling of 1911631990 in words is "one billion, nine hundred eleven million, six hundred thirty-one thousand, nine hundred ninety".