612611251 has 4 divisors (see below), whose sum is σ = 700127152. Its totient is φ = 525095352.

The previous prime is 612611249. The next prime is 612611327. The reversal of 612611251 is 152116216.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 612611251 - 2¹ = 612611249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612011251) 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, 43757940 + ... + 43757953.

It is an arithmetic number, because the mean of its divisors is an integer number (175031788).

Almost surely, 2^612611251 is an apocalyptic number.

612611251 is a deficient number, since it is larger than the sum of its proper divisors (87515901).

612611251 is an equidigital number, since it uses as much as digits as its factorization.

612611251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87515900.

The product of its digits is 720, while the sum is 25.

The square root of 612611251 is about 24750.9848490924. The cubic root of 612611251 is about 849.3010406246.

Adding to 612611251 its reverse (152116216), we get a palindrome (764727467).

The spelling of 612611251 in words is "six hundred twelve million, six hundred eleven thousand, two hundred fifty-one".