157891451 has 4 divisors (see below), whose sum is σ = 161742504. Its totient is φ = 154040400.

The previous prime is 157891441. The next prime is 157891453. The reversal of 157891451 is 154198751.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157891451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 3851011 = 157891451 / (1 + 5 + 7 + 8 + 9 + 1 + 4 + 5 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157891399 and 157891408.

It is not an unprimeable number, because it can be changed into a prime (157891453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1925465 + ... + 1925546.

It is an arithmetic number, because the mean of its divisors is an integer number (40435626).

Almost surely, 2^157891451 is an apocalyptic number.

157891451 is a deficient number, since it is larger than the sum of its proper divisors (3851053).

157891451 is an equidigital number, since it uses as much as digits as its factorization.

157891451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3851052.

The product of its digits is 50400, while the sum is 41.

The square root of 157891451 is about 12565.4865007289. The cubic root of 157891451 is about 540.4881856388.

The spelling of 157891451 in words is "one hundred fifty-seven million, eight hundred ninety-one thousand, four hundred fifty-one".