610991919 has 12 divisors (see below), whose sum is σ = 885733576. Its totient is φ = 405855792.

The previous prime is 610991879. The next prime is 610991929. The reversal of 610991919 is 919199016.

610991919 is a `hidden beast` number, since 610 + 9 + 9 + 19 + 19 = 666.

It is not a de Polignac number, because 610991919 - 2¹² = 610987823 is a prime.

It is a super-2 number, since 2×610991919² = 746622250166605122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610991929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120049 + ... + 125034.

Almost surely, 2^610991919 is an apocalyptic number.

610991919 is a deficient number, since it is larger than the sum of its proper divisors (274741657).

610991919 is a wasteful number, since it uses less digits than its factorization.

610991919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245366 (or 245363 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 45.

The square root of 610991919 is about 24718.2507269426. The cubic root of 610991919 is about 848.5520534418.

The spelling of 610991919 in words is "six hundred ten million, nine hundred ninety-one thousand, nine hundred nineteen".