1612361551 has 4 divisors (see below), whose sum is σ = 1613267632. Its totient is φ = 1611455472.

The previous prime is 1612361539. The next prime is 1612361561. The reversal of 1612361551 is 1551632161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1551632161 = 487 ⋅3186103.

It is a cyclic number.

It is not a de Polignac number, because 1612361551 - 2⁷ = 1612361423 is a prime.

It is a super-2 number, since 2×1612361551² = 5199419542286251202, 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 (1612361561) 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, 450366 + ... + 453931.

It is an arithmetic number, because the mean of its divisors is an integer number (403316908).

Almost surely, 2^1612361551 is an apocalyptic number.

1612361551 is a deficient number, since it is larger than the sum of its proper divisors (906081).

1612361551 is an equidigital number, since it uses as much as digits as its factorization.

1612361551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906080.

The product of its digits is 5400, while the sum is 31.

The square root of 1612361551 is about 40154.2220818683. Note that the first 3 decimals coincide. The cubic root of 1612361551 is about 1172.6114874371.

The spelling of 1612361551 in words is "one billion, six hundred twelve million, three hundred sixty-one thousand, five hundred fifty-one".