7912121161 has 8 divisors (see below), whose sum is σ = 9043431104. Its totient is φ = 6781062960.

The previous prime is 7912121137. The next prime is 7912121167. The reversal of 7912121161 is 1611212197.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7912121161 - 2¹³ = 7912112969 is a prime.

It is a super-2 number, since 2×7912121161² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7912121167) 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, 10066 + ... + 126196.

It is an arithmetic number, because the mean of its divisors is an integer number (1130428888).

Almost surely, 2^7912121161 is an apocalyptic number.

It is an amenable number.

7912121161 is a deficient number, since it is larger than the sum of its proper divisors (1131309943).

7912121161 is a wasteful number, since it uses less digits than its factorization.

7912121161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125871.

The product of its digits is 1512, while the sum is 31.

The square root of 7912121161 is about 88950.1048959471. The cubic root of 7912121161 is about 1992.6497836683.

The spelling of 7912121161 in words is "seven billion, nine hundred twelve million, one hundred twenty-one thousand, one hundred sixty-one".