78151097 has 4 divisors (see below), whose sum is σ = 79625700. Its totient is φ = 76676496.

The previous prime is 78151039. The next prime is 78151103. The reversal of 78151097 is 79015187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79015187 = 31 ⋅2548877.

It can be written as a sum of positive squares in 2 ways, for example, as 51566761 + 26584336 = 7181^2 + 5156^2 .

It is a cyclic number.

It is not a de Polignac number, because 78151097 - 2¹⁶ = 78085561 is a prime.

It is a super-2 number, since 2×78151097² = 12215187924606818, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78151097.

It is not an unprimeable number, because it can be changed into a prime (78951097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737222 + ... + 737327.

It is an arithmetic number, because the mean of its divisors is an integer number (19906425).

Almost surely, 2^78151097 is an apocalyptic number.

It is an amenable number.

78151097 is a deficient number, since it is larger than the sum of its proper divisors (1474603).

78151097 is a wasteful number, since it uses less digits than its factorization.

78151097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474602.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 78151097 is about 8840.3109108221. The cubic root of 78151097 is about 427.5415816284.

The spelling of 78151097 in words is "seventy-eight million, one hundred fifty-one thousand, ninety-seven".