78401461 has 2 divisors, whose sum is σ = 78401462. Its totient is φ = 78401460.

The previous prime is 78401443. The next prime is 78401497. The reversal of 78401461 is 16410487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 78961 = 8850^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 78401461 - 2⁷ = 78401333 is a prime.

It is a super-2 number, since 2×78401461² = 12293578173869042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78402461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39200730 + 39200731.

It is an arithmetic number, because the mean of its divisors is an integer number (39200731).

Almost surely, 2^78401461 is an apocalyptic number.

It is an amenable number.

78401461 is a deficient number, since it is larger than the sum of its proper divisors (1).

78401461 is an equidigital number, since it uses as much as digits as its factorization.

78401461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 78401461 is about 8854.4599496525. The cubic root of 78401461 is about 427.9976508009.

The spelling of 78401461 in words is "seventy-eight million, four hundred one thousand, four hundred sixty-one".