1612890649 has 4 divisors (see below), whose sum is σ = 1613537536. Its totient is φ = 1612243764.

The previous prime is 1612890641. The next prime is 1612890667. The reversal of 1612890649 is 9460982161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1612890649 - 2³ = 1612890641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1612890599 and 1612890608.

It is not an unprimeable number, because it can be changed into a prime (1612890641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319689 + ... + 324694.

It is an arithmetic number, because the mean of its divisors is an integer number (403384384).

Almost surely, 2^1612890649 is an apocalyptic number.

It is an amenable number.

1612890649 is a deficient number, since it is larger than the sum of its proper divisors (646887).

1612890649 is an equidigital number, since it uses as much as digits as its factorization.

1612890649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646886.

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

The square root of 1612890649 is about 40160.8098648421. The cubic root of 1612890649 is about 1172.7397379403.

It can be divided in two parts, 161 and 2890649, that added together give a triangular number (2890810 = T₂₄₀₄).

The spelling of 1612890649 in words is "one billion, six hundred twelve million, eight hundred ninety thousand, six hundred forty-nine".