61312121 has 16 divisors (see below), whose sum is σ = 67511808. Its totient is φ = 55339200.

The previous prime is 61312103. The next prime is 61312133. The reversal of 61312121 is 12121316.

It is a cyclic number.

It is not a de Polignac number, because 61312121 - 2¹⁴ = 61295737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61312121.

It is not an unprimeable number, because it can be changed into a prime (61312721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166880 + ... + 167246.

It is an arithmetic number, because the mean of its divisors is an integer number (4219488).

Almost surely, 2^61312121 is an apocalyptic number.

It is an amenable number.

61312121 is a deficient number, since it is larger than the sum of its proper divisors (6199687).

61312121 is a wasteful number, since it uses less digits than its factorization.

61312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632.

The product of its digits is 72, while the sum is 17.

The square root of 61312121 is about 7830.2056805680. The cubic root of 61312121 is about 394.3199772125.

Adding to 61312121 its reverse (12121316), we get a palindrome (73433437).

The spelling of 61312121 in words is "sixty-one million, three hundred twelve thousand, one hundred twenty-one".