78151903 has 2 divisors, whose sum is σ = 78151904. Its totient is φ = 78151902.

The previous prime is 78151891. The next prime is 78151933. The reversal of 78151903 is 30915187.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78151903 - 2²¹ = 76054751 is a prime.

It is a super-2 number, since 2×78151903² = 12215439885042818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78151933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39075951 + 39075952.

It is an arithmetic number, because the mean of its divisors is an integer number (39075952).

Almost surely, 2^78151903 is an apocalyptic number.

78151903 is a deficient number, since it is larger than the sum of its proper divisors (1).

78151903 is an equidigital number, since it uses as much as digits as its factorization.

78151903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 78151903 is about 8840.3564973365. The cubic root of 78151903 is about 427.5430514194.

The spelling of 78151903 in words is "seventy-eight million, one hundred fifty-one thousand, nine hundred three".