999961512 has 32 divisors (see below), whose sum is σ = 2727168480. Its totient is φ = 303018560.

The previous prime is 999961511. The next prime is 999961537. The reversal of 999961512 is 215169999.

It is a happy number.

It is a super-2 number, since 2×999961512² = 1999846050962652288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999961511) 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, 1893603 + ... + 1894130.

It is an arithmetic number, because the mean of its divisors is an integer number (85224015).

Almost surely, 2^999961512 is an apocalyptic number.

It is an amenable number.

999961512 is an abundant number, since it is smaller than the sum of its proper divisors (1727206968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999961512 is a wasteful number, since it uses less digits than its factorization.

999961512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3787753 (or 3787749 counting only the distinct ones).

The product of its digits is 393660, while the sum is 51.

The square root of 999961512 is about 31622.1680471153. The cubic root of 999961512 is about 999.9871705021.

The spelling of 999961512 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, five hundred twelve".