1249921154 has 16 divisors (see below), whose sum is σ = 1993315392. Its totient is φ = 586508208.

The previous prime is 1249921151. The next prime is 1249921163. The reversal of 1249921154 is 4511299421.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1249921151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253904 + ... + 258779.

It is an arithmetic number, because the mean of its divisors is an integer number (124582212).

Almost surely, 2^1249921154 is an apocalyptic number.

1249921154 is a deficient number, since it is larger than the sum of its proper divisors (743394238).

1249921154 is a wasteful number, since it uses less digits than its factorization.

1249921154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512761.

The product of its digits is 25920, while the sum is 38.

The square root of 1249921154 is about 35354.2239909180. The cubic root of 1249921154 is about 1077.1946953987.

The spelling of 1249921154 in words is "one billion, two hundred forty-nine million, nine hundred twenty-one thousand, one hundred fifty-four".