19621037461 has 2 divisors, whose sum is σ = 19621037462. Its totient is φ = 19621037460.

The previous prime is 19621037437. The next prime is 19621037467. The reversal of 19621037461 is 16473012691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18552074436 + 1068963025 = 136206^2 + 32695^2 .

It is a cyclic number.

It is not a de Polignac number, because 19621037461 - 2¹⁵ = 19621004693 is a prime.

It is a super-2 number, since 2×19621037461² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19621037467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9810518730 + 9810518731.

It is an arithmetic number, because the mean of its divisors is an integer number (9810518731).

Almost surely, 2^19621037461 is an apocalyptic number.

It is an amenable number.

19621037461 is a deficient number, since it is larger than the sum of its proper divisors (1).

19621037461 is an equidigital number, since it uses as much as digits as its factorization.

19621037461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 19621037461 in words is "nineteen billion, six hundred twenty-one million, thirty-seven thousand, four hundred sixty-one".