1616610251 has 4 divisors (see below), whose sum is σ = 1617223632. Its totient is φ = 1615996872.

The previous prime is 1616610239. The next prime is 1616610277. The reversal of 1616610251 is 1520166161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1520166161 = 71 ⋅21410791.

It is a cyclic number.

It is not a de Polignac number, because 1616610251 - 2³⁰ = 542868427 is a prime.

It is a super-2 number, since 2×1616610251² = 5226857407276566002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616610211) 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, 302720 + ... + 308013.

It is an arithmetic number, because the mean of its divisors is an integer number (404305908).

Almost surely, 2^1616610251 is an apocalyptic number.

1616610251 is a deficient number, since it is larger than the sum of its proper divisors (613381).

1616610251 is an equidigital number, since it uses as much as digits as its factorization.

1616610251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613380.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1616610251 is about 40207.0920485429. The cubic root of 1616610251 is about 1173.6405586909.

The spelling of 1616610251 in words is "one billion, six hundred sixteen million, six hundred ten thousand, two hundred fifty-one".