150451991 has 2 divisors, whose sum is σ = 150451992. Its totient is φ = 150451990.

The previous prime is 150451979. The next prime is 150451999. The reversal of 150451991 is 199154051.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-150451991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (150451999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75225995 + 75225996.

It is an arithmetic number, because the mean of its divisors is an integer number (75225996).

Almost surely, 2^150451991 is an apocalyptic number.

150451991 is a deficient number, since it is larger than the sum of its proper divisors (1).

150451991 is an equidigital number, since it uses as much as digits as its factorization.

150451991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 150451991 is about 12265.8872895523. The cubic root of 150451991 is about 531.8624295670.

The spelling of 150451991 in words is "one hundred fifty million, four hundred fifty-one thousand, nine hundred ninety-one".