1621316254 has 4 divisors (see below), whose sum is σ = 2431974384. Its totient is φ = 810658126.

The previous prime is 1621316251. The next prime is 1621316309. The reversal of 1621316254 is 4526131261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4526131261 = 547 ⋅8274463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621316251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405329062 + ... + 405329065.

It is an arithmetic number, because the mean of its divisors is an integer number (607993596).

Almost surely, 2^1621316254 is an apocalyptic number.

1621316254 is a deficient number, since it is larger than the sum of its proper divisors (810658130).

1621316254 is an equidigital number, since it uses as much as digits as its factorization.

1621316254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810658129.

The product of its digits is 8640, while the sum is 31.

The square root of 1621316254 is about 40265.5715717535. The cubic root of 1621316254 is about 1174.7782902040.

The spelling of 1621316254 in words is "one billion, six hundred twenty-one million, three hundred sixteen thousand, two hundred fifty-four".