612721071 has 8 divisors (see below), whose sum is σ = 907734960. Its totient is φ = 408480696.

The previous prime is 612721049. The next prime is 612721079. The reversal of 612721071 is 170127216.

It is not a de Polignac number, because 612721071 - 2¹⁰ = 612720047 is a prime.

It is a super-2 number, since 2×612721071² = 750854221694774082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 22693373 = 612721071 / (6 + 1 + 2 + 7 + 2 + 1 + 0 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612721079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11346660 + ... + 11346713.

It is an arithmetic number, because the mean of its divisors is an integer number (113466870).

Almost surely, 2^612721071 is an apocalyptic number.

612721071 is a deficient number, since it is larger than the sum of its proper divisors (295013889).

612721071 is a wasteful number, since it uses less digits than its factorization.

612721071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22693382 (or 22693376 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 612721071 is about 24753.2032472567. The cubic root of 612721071 is about 849.3517876888.

Adding to 612721071 its reverse (170127216), we get a palindrome (782848287).

The spelling of 612721071 in words is "six hundred twelve million, seven hundred twenty-one thousand, seventy-one".