157421767 has 2 divisors, whose sum is σ = 157421768. Its totient is φ = 157421766.

The previous prime is 157421743. The next prime is 157421807. The reversal of 157421767 is 767124751.

It is a happy number.

It is an a-pointer prime, because the next prime (157421807) can be obtained adding 157421767 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157421767 is a prime.

It is a super-2 number, since 2×157421767² = 49563225450804578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157421567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78710883 + 78710884.

It is an arithmetic number, because the mean of its divisors is an integer number (78710884).

Almost surely, 2^157421767 is an apocalyptic number.

157421767 is a deficient number, since it is larger than the sum of its proper divisors (1).

157421767 is an equidigital number, since it uses as much as digits as its factorization.

157421767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82320, while the sum is 40.

The square root of 157421767 is about 12546.7831335367. The cubic root of 157421767 is about 539.9517183627.

The spelling of 157421767 in words is "one hundred fifty-seven million, four hundred twenty-one thousand, seven hundred sixty-seven".