154991951 has 2 divisors, whose sum is σ = 154991952. Its totient is φ = 154991950.

The previous prime is 154991923. The next prime is 154991953. The reversal of 154991951 is 159199451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 154991951 - 2¹⁴ = 154975567 is a prime.

Together with 154991953, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154991953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77495975 + 77495976.

It is an arithmetic number, because the mean of its divisors is an integer number (77495976).

Almost surely, 2^154991951 is an apocalyptic number.

154991951 is a deficient number, since it is larger than the sum of its proper divisors (1).

154991951 is an equidigital number, since it uses as much as digits as its factorization.

154991951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 44.

The square root of 154991951 is about 12449.5763381731. The cubic root of 154991951 is about 537.1592371195.

The spelling of 154991951 in words is "one hundred fifty-four million, nine hundred ninety-one thousand, nine hundred fifty-one".