78237541 has 2 divisors, whose sum is σ = 78237542. Its totient is φ = 78237540.

The previous prime is 78237493. The next prime is 78237547. The reversal of 78237541 is 14573287.

78237541 = 6254² + 6255².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39125025 + 39112516 = 6255^2 + 6254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78237541 is a prime.

It is a super-2 number, since 2×78237541² = 12242225643453362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78237541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78237547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39118770 + 39118771.

It is an arithmetic number, because the mean of its divisors is an integer number (39118771).

Almost surely, 2^78237541 is an apocalyptic number.

78237541 is the 6255-th centered square number.

It is an amenable number.

78237541 is a deficient number, since it is larger than the sum of its proper divisors (1).

78237541 is an equidigital number, since it uses as much as digits as its factorization.

78237541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 78237541 is about 8845.1987541264. The cubic root of 78237541 is about 427.6991600781.

The spelling of 78237541 in words is "seventy-eight million, two hundred thirty-seven thousand, five hundred forty-one".