157478261 has 2 divisors, whose sum is σ = 157478262. Its totient is φ = 157478260.

The previous prime is 157478231. The next prime is 157478273. The reversal of 157478261 is 162874751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146555236 + 10923025 = 12106^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 157478261 - 2⁶ = 157478197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157478201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78739130 + 78739131.

It is an arithmetic number, because the mean of its divisors is an integer number (78739131).

Almost surely, 2^157478261 is an apocalyptic number.

It is an amenable number.

157478261 is a deficient number, since it is larger than the sum of its proper divisors (1).

157478261 is an equidigital number, since it uses as much as digits as its factorization.

157478261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 41.

The square root of 157478261 is about 12549.0342656318. The cubic root of 157478261 is about 540.0163015198.

The spelling of 157478261 in words is "one hundred fifty-seven million, four hundred seventy-eight thousand, two hundred sixty-one".