40698624121 has 9 divisors (see below), whose sum is σ = 43237129999. Its totient is φ = 38301359584.

The previous prime is 40698624097. The next prime is 40698624167. The reversal of 40698624121 is 12142689604.

The square root of 40698624121 is 201739.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 31685780025 + 9012844096 = 178005^2 + 94936^2 .

It is not a de Polignac number, because 40698624121 - 2¹⁷ = 40698493049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40698624521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3423630 + ... + 3435496.

Almost surely, 2^40698624121 is an apocalyptic number.

40698624121 is the 201739-th square number.

40698624121 is the 100870-th centered octagonal number.

It is an amenable number.

40698624121 is a deficient number, since it is larger than the sum of its proper divisors (2538505878).

40698624121 is an frugal number, since it uses more digits than its factorization.

40698624121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23768 (or 11884 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 40698624121 in words is "forty billion, six hundred ninety-eight million, six hundred twenty-four thousand, one hundred twenty-one".