157781051 has 2 divisors, whose sum is σ = 157781052. Its totient is φ = 157781050.

The previous prime is 157781009. The next prime is 157781101. The reversal of 157781051 is 150187751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157781051 - 2¹⁴ = 157764667 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157781651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78890525 + 78890526.

It is an arithmetic number, because the mean of its divisors is an integer number (78890526).

Almost surely, 2^157781051 is an apocalyptic number.

157781051 is a deficient number, since it is larger than the sum of its proper divisors (1).

157781051 is an equidigital number, since it uses as much as digits as its factorization.

157781051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 35.

The square root of 157781051 is about 12561.0927470503. The cubic root of 157781051 is about 540.3621838655.

It can be divided in two parts, 1577 and 81051, that added together give a palindrome (82628).

The spelling of 157781051 in words is "one hundred fifty-seven million, seven hundred eighty-one thousand, fifty-one".