151878491 has 2 divisors, whose sum is σ = 151878492. Its totient is φ = 151878490.

The previous prime is 151878439. The next prime is 151878497. The reversal of 151878491 is 194878151.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 151878491 - 2¹⁴ = 151862107 is a prime.

It is not a weakly prime, because it can be changed into another prime (151878497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75939245 + 75939246.

It is an arithmetic number, because the mean of its divisors is an integer number (75939246).

Almost surely, 2^151878491 is an apocalyptic number.

151878491 is a deficient number, since it is larger than the sum of its proper divisors (1).

151878491 is an equidigital number, since it uses as much as digits as its factorization.

151878491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 44.

The square root of 151878491 is about 12323.8991800485. The cubic root of 151878491 is about 533.5380835811.

The spelling of 151878491 in words is "one hundred fifty-one million, eight hundred seventy-eight thousand, four hundred ninety-one".