78955501 has 2 divisors, whose sum is σ = 78955502. Its totient is φ = 78955500.

The previous prime is 78955477. The next prime is 78955517. The reversal of 78955501 is 10555987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68906601 + 10048900 = 8301^2 + 3170^2 .

It is a cyclic number.

It is not a de Polignac number, because 78955501 - 2⁹ = 78954989 is a prime.

It is a super-2 number, since 2×78955501² = 12467942276322002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78955561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39477750 + 39477751.

It is an arithmetic number, because the mean of its divisors is an integer number (39477751).

Almost surely, 2^78955501 is an apocalyptic number.

It is an amenable number.

78955501 is a deficient number, since it is larger than the sum of its proper divisors (1).

78955501 is an equidigital number, since it uses as much as digits as its factorization.

78955501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 78955501 is about 8885.6908003824. The cubic root of 78955501 is about 429.0034629685.

The spelling of 78955501 in words is "seventy-eight million, nine hundred fifty-five thousand, five hundred one".