1612611561 has 16 divisors (see below), whose sum is σ = 2349448128. Its totient is φ = 975744000.

The previous prime is 1612611547. The next prime is 1612611563. The reversal of 1612611561 is 1651162161.

It is not a de Polignac number, because 1612611561 - 2¹⁴ = 1612595177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1612611563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19240 + ... + 59961.

It is an arithmetic number, because the mean of its divisors is an integer number (146840508).

Almost surely, 2^1612611561 is an apocalyptic number.

1612611561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1612611561 is a deficient number, since it is larger than the sum of its proper divisors (736836567).

1612611561 is a wasteful number, since it uses less digits than its factorization.

1612611561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79832.

The product of its digits is 2160, while the sum is 30.

The square root of 1612611561 is about 40157.3350833942. The cubic root of 1612611561 is about 1172.6720920095.

The spelling of 1612611561 in words is "one billion, six hundred twelve million, six hundred eleven thousand, five hundred sixty-one".