612161901 has 32 divisors (see below), whose sum is σ = 992714240. Its totient is φ = 370526400.

The previous prime is 612161863. The next prime is 612161911. The reversal of 612161901 is 109161216.

It is not a de Polignac number, because 612161901 - 2¹⁷ = 612030829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612161911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7116 + ... + 35706.

It is an arithmetic number, because the mean of its divisors is an integer number (31022320).

Almost surely, 2^612161901 is an apocalyptic number.

612161901 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

612161901 is a deficient number, since it is larger than the sum of its proper divisors (380552339).

612161901 is a wasteful number, since it uses less digits than its factorization.

612161901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28674 (or 28668 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 612161901 is about 24741.9057673414. The cubic root of 612161901 is about 849.0933358910.

The spelling of 612161901 in words is "six hundred twelve million, one hundred sixty-one thousand, nine hundred one".